Audio Files Page Level Two of Three

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Audio Links on OTHER PAGES and my web-sites - PAGE DOWN TO THE AUDIO FILES ON THIS PAGE:

1. SOUND FILES PAGE ONE
2. Solar-maximum Expeditions: Alberta 2000, Saskatchewan/Alberta 2001
3. Long-Baseline Stereo recordings
4. More Alberta June 1996 solar-minimum recordings
5. More Manitoba Aug. 1996 Solar-minimum Expedition audio

Auroral Chorus Compact-Disc Recordings Page

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SOUND FILES PAGE ONE

.MP3/.WAV AUDIO FILES:

Northern Alberta, Canada (Whitemud River region)

(Additional Alberta June 1996 files are at this link.

02 June 1996 - 0100 UTC: Eerie wavering tones and what I believe are overlapping nose-whistlers (containing simultaneous rising and falling components) - many resulting from fairly local lightning storms at this 7 p.m. MDT local time near the Whitemud River about 35 km west of Dixonville, Alberta, Canada. (This location, like the Manitoba location above, is a near-auroral zone region where natural radio sounds are the loudest and have the most variety) ab696d22.mp3, 21.5 sec., 462K MB, 22050 Hz sampling-rate/8-bit/mono

02 June 1996 - approx. 1345 UT. This is a fine example of a "Nose Whistler" more frequently heard at higher geomagnetic latitudes. This type of whistler is called a nose whistler due to the way a spectrogram image of the sound resembles a nose. Recorded on a McGreevy WR-4b receiver with 2.5 meter-tall vertical antenna. Preceeding this nose whistler cluster is a wavering-tone emission. abnosew.mp3, 12.8 sec., 572436 bytes, 22050 Hz sampling-rate/16-bit/mono

02 June 1996 - 1030 UTC - A LONG RECORDING AND A VERY FASCINATING RECORDING OF EERIE WAVERING-TONES recorded 45 miles/60 km n.w. of Peace River, Alberta, Canada. Slowly rising and falling in pitch and long-duration emissions ALONG WITH HOARDS OF NOSE-WHISTLERS. I had never heard such a natural VLF-emission sound quite like this before (or since) this particular day, and this is a truly unique recording on the U. Iowa PWG server: abwt001.zip, 156 sec., 1.7 MB (abwt001.wav compressed into this 477 kB ZIP file - unzip using PKUNZIP 2.04G or later version)

1) Strong Chorus and Risers recorded in STEREO. This recording was made on the morning of June 20, 1998 at approximately 1430 UTC (8.30 a.m. MDT) from Belly River Campground using TWO large-loop receiving systems developed by Stephen Ratzlaff and Stephen McGreevy. The right channel is a loop oriented for maximum receive sensitivity toward magnetic north/south (along the magnetic longitude), and the left channel a loop oriented for maximum null (minumum sensitivity) toward the magnetic longitude, thus resulting in the stereo/diversity reception with differences in each channel. The loops are hung in trees in rough triangular (delta) shape and are five and six turn loops about 60 feet in length around their perimeters.

Spectacularly strong risers, wavering-tone emissions, and chorus. (The evening before this recording was made, streams of pure-tone whistlers at a rate of about 50 per minute followed strong lightning static bursts). Minor geo-magnetic storm in progress. abrisrs5.mp3, 35 sec.,1545528 bytes, 22050 kHz/16 bit sampling/data rate for bandwidth 0 - 11.025 kHz

2) Frequent, nearly pure-tone whistlers occur after strong, semi-local (within 25 km) lightning storms that plauged the area the preceeding couple of days. Recorded at Belly River Campground in Waterton Park on the evening of July 19, 1998 at approx. 7.30 p.m. MDT (0130 UT-20 June). Note the stereo-effect is very obvious with the lightning static and in the slight variation of the whistlers, but not as much as the sferics, indicating that the whistler ducts and the whistlers were arriving in a near-vertical plane! Same exact receiving system as the above audio-file. This is also a STEREO audio-file: stwhi4.mp3, 14 sec.216503 bytes, bandwidth 0 - 11.025 kHz

3) Higher quality .WAV file of similar reception and time period of nice, pure-tone whistlers emanating from lightning storms all around the local area in the nearby Rocky Mountains and Plains of Alberta and Montana. 20 June 98 at about 0100 UT (7 pm MDT 19 June 98) 2.9 MB : stwhi2.wav, 32 seconds, bandwidth 0 - 11.025 kHz

1) A Strong two-hop near pure-tone whistler with a very weak 4-hop echo and weak, broadband hissband. Initiating lightning pop-tweek audible. Tue., 23 March 1999 at 1240 UT / 4.40 a.m. PST. ov32399a.mp3. 22050Hz/8-bit, 164K, 7.6 sec. McGreevy WR-4b receiver, 9 ft. vertical whip antenna. There were one or two weaker whistlers per-minute, and strong ones like this whistler every 10 to 15 minutes or so. Activity died away by sunrise (1400 UT/6 a.m. PT). View spectrogram of this big whistler: ov32399a.jpg.

The whistler above is a nearly identical whistler (but not quite as strong) to the incredably loud one I taped on 09 March 1997 at about 0420 UT from the same place 6 miles s.w. of Lone Pine, California.

Panamint Valley Whistler Shower, 12 March 1998, 1330 UT.:

This beautiful valley with lovely star-dunes in its northern extreme is a remote place perfect for natural radio listening in this region of south-eastern California. I went on a 2 day trip to get away from lingering snow in the Owens Valley 30 miles to the west, where I reside. There were frequent (though not very loud) whistlers occurring at a fairly high rate of about 10 - 15 per minute on average, with an occasional, slow-falling, near-pure-tone whistler here and there. This was the first morning I've been able to get out in a VLF-quiet zone to record natural radio in 1999. Taped next to Lake Hill and the beautiful striped Panamint Butte: pvws0312.mp3, 14.5 sec., 160050-bytes, 11025 kHz/8 bit sampling/data rate for bandwidth 0 - 5.5 kHz

View color photograph of the beautiful northern end of the Panamint Valley in Death Valley National Park, including the Panamint Dunes, photographed March 1998 by S.P. McGreevy. A splendid VLF-quiet zone. This is one of my favorite places in winter and spring to visit and record natural radio close to where I live.

Death Valley Whistlers, 27 March 2000, 1000 UT.: Driving home from a camping and radio expedition trip to Cima Dome in the eastern Mojave Desert's Mojave National Preserve, I stopped in south Death Valley around evening time on a Sunday to rest and catch some sleep. Awaking at 2 a.m. local time, I brought out my WR-3E hand-held receiver and taped these nice growler whistlers at about 2.45 a.m. PT (1055 UT). They went on even past 4 a.m. during my last stop on Crowley Lookout before I descended into the Owens Valley and arrived home. dv032700.mp3, 18.8 sec., 813 KB, 22055 kHz/16 bit sampling/data rate for bandwidth 0 - 11 kHz

1. 23a1505.mp3, 413K, 37 sec. duration Manitoba Chorus, 8/96, mono
2. 25a1700.mp3, 157212 bytes, 14.25 sec. duration Manitoba Chorus, 8/96, mono
3. 27a1545.mp3, 177588 bytes, 16 sec. duration Manitoba Chorus, 8/96, mono
4. stwhi4.mp3, 14 sec. duration, 1192596 bytes Alberta whistlers, 6/98, stereo
5. abrisrs5.mp3 35 sec. duration, 1545528 bytes, Alberta Risers/Chorus, 6/98, stereo
6. ov32399a.mp3. 22050Hz/8-bit, 164K, 7.6 sec. Strong Whistler taped near Lone Pine, California.
7. pvws0312.mp3. 22050Hz/8-bit, 155K, 14.5 sec. Panamint valley (Death Valley NP) Whistler Shower.
8. c09m0420.mp3 Mongo whistler taped near Lone Pine, Calif., 155 K, 10 sec.
9. ab696d22.mp3, Eerie mixture of wavering tones and nose-whistlers, Whitemud River Region, Alberta, 02 June 96 21.5 sec., 462K MB, 22050 Hz sampling-rate/8-bit/mono
10. abnosew.mp3, Fine example of a Nose Whistler, Whitemud River Region, Alberta, Canada, 02 June 1996, 1345 UT. 12.8 sec., 572436 bytes, 22050 Hz sampling-rate/16-bit/mono.
11. dv032700.mp3, 18.8 sec., 813 KB, 22055 kHz/16 bit sampling/data rate for bandwidth 0 - 11 kHz. Whistlers taped in Death Valley 27 March 2000 at about 1055 UT.
12. Joshua Tree National Park, s.e. California: Whistlers at 1125 UT (4:25 a.m. PDT), Monday 23 October 2001. 643KB at 96 kbps quality, 1.5 minutes duration, mono.
13. Spectacular 645KB MP3 file over 1 minute in length of "hooks" recorded in northern Alberta, Canada on 13 August 2000 at approx 1500 UT.
14. More supurb Alberta June 1996 Expedition audio
15. Compilation of loud whistlers recorded 23 April 2002 (0700 - 1300 UT) from northern Death Valley a few miles from Scotty's Castle. about 30 sec., (223 KB)
16. Selected tracks from "Auroral Chorus III" CD album to be released mid 2002.
17. Waterton Park, Alberta, Canada stereo whistlers June 20, 1998: higher quality .WAV file of similar reception and time period of nice, pure-tone whistlers emanating from lightning storms all around the local area in the nearby Rocky Mountains and Plains of Alberta and Montana. 20 June 98 at about 0100 UT (7 pm MDT 19 June 98) 2.9 MB : stwhi2.wav, 32 seconds, bandwidth 0 - 11.025 kHz
18. Whistlers in the Nevada Desert, Sept. 1999: Streams of pure-tone whistlers recorded in central Nevada, near Rachel, Nev. and Area 51 on the morning (about 0500 PDT/1200 UT) 17th September 1999 on my way to Zion National Park. 1.4 MB, 21 seconds - from lightning storms (moonsoon type) in the general area. nv91799b.wav
19. London Battersea Park Whistlers recorded 10 May 1996 at 9:10 p.m. BST handheld with a WR-3 into my Marantz PMD-212 cassette recorder, somewhere in an open place away from trees north of the football (soccer) playing pitches near the western edge of the park. The varying levels of background hum are from the railway lines from Victoria Station that pass by the western edge of the park. 55 sec., 654 KB, 64 kbps MP3 file.
20. Donegal Whistlers 04 May 96 at about 10:00 p.m. BST. 58 seconds, 482 KB, 64 kbps
21. Fish Rock Road Whistlers, Mendocino County Calif. - GORGEOUS WHISTLERS 1.5 MB, 2 minutes, 64 kbps.

The other natural radio audio-file sites by S. McGreevy:

www.auroralchorus.comMain Natural VLF Radio Information Site

McGreevy Ground-Based VLF Recordings at U. Iowa Plasma-Wave Group Website

PC spectrogram software

For other natural VLF radio sound files I recorded between 1991 and 1995, please go to the University of Iowa Plasma Wave Group Web site to hear more McGreevy Ground-Based VLF Recordings from 1991 to 1995, and also one of my best June 1996 Alberta recordings recorded via my WR-4B van-based receiver.

McGreevy BBB-4b Bare-Bones Basic (but great!) whip receiver you can build yourself to listen live to natural radio.

The WR-3 hand-held VLF/Whistler Receiver is available, the 2002 version improvements have better audio filters (are clean, low-noise passive LC filters). See: WR-3 Receiver Information Page

"Auroral Choruses I to III: Music of the Magnetosphere" - Triple album MP3/JPG/PD data version with 6 hours of audio, e-books, over 50 photographs now available.

WR-3 Receiver Information - Listen for yourself!

This and other CD info available at this link - SpM

SOUND FILES PAGE ONE